<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>画盒子</title>
    <style>
        .red {
            width: 100px;
            height: 100px;
            background-color: red;
        }

        .orange{
            width: 200px;
            height: 200px;
            background-color: orange;
        }
        .haha{
            /*font-weight: bold;*/
            /*font-weight: 700;*/

            font-weight: 400;

        }

    </style>
</head>
<body>
<div class="red">div1</div>
<div class="orange">div2</div>
<div class="haha">哈哈</div>
</body>
</html>
